Typewriting machine



Mar. 6, 1923.

J. E. DAVIDSON. TYPEWRITING MACHINE.

2 SHEET `SHEET 2.

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Patented Mar. 6, 1923.

@METRE @ATWT @FFME JOSHUA E. DAVIDSON, OF NEW YORK, N. Y., ASSIGNOR TO UNDERWOOD TYPEWRITER i COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

To all 'whom t may concern.'

Be it known that I, JOSHUA E. DAVIDSON, a citizenof the United States, residing in borough of the Bronx, in the county of the Bronx, city and State of New York, have invented certain new vand useful Improvements in Typewriting Machines, of which the following is a specification. p

This invention relates to typewriting machines, and is herein disclosed as applied to an Underwood continuous billing machine, one form of which is disclosed in the patent to `Wernery and Smith, No. 1,132,055, dated March 16, 1915, in which the typewriter carriage comprises a rearward extension upon which is reciprocable forwardly and rearwardly a sub-carriage for carbon-sheets.

In such machines, the carbon-sheets have hitherto been sheets of limited length, which were clipped to bars upon the carbon-paper carriage. Ihen any sheet was worn out,

the clip was released and a new sheet substituted.

vAccording to the present invention, there may be substituted, in this and other kinds of typewriting machines, carbon-supply rolls, carried upon spools or rollers, which are illustrated as mounted upon the carbon-` paper carriage. The rolls are held against rotation to prevent accidental unwinding. A lock for each roll holds vit normally against rotation, and means is provided for simultaneously unlocking all of said rolls to permit the strips of carbon to be drawn olf.

An object of this invention is to secure simplicity and inexpensiveness of stnucture and ease of operation. y.

Other features and advantages will hereinafter appear.

In the accompanying drawings.

Figure 1 is a vertical section of the carriage of an Underwood continuous billing machine with the uinvention applied to the carbon-paper carriage, only the necessary co-operating elements of the machine belng shown.

Figure 2 is a front View of the carbonpaper carriage.

Figure 3 is a detail showing the mounting of a carbon-sheet roll upon a supporting shaft.

Figure 4 is a section showing the special configuration of a supporting shaft whereby a carbon-sheet roll is held against rotation thereon. y

Figure 5 is a view similar to Figure 4 and showing a carbon-sheet wo-und upon the carbon-sheet roll.

In the usual Underwood continuous billing machine, work-webs 1, 2, 3, 4 and 5 are led down over a rear paper-table 6, forming part of the typewriter-carriage 7, and are held against the platen 8 by the usual rear and front feed-rolls 9 and 10.

The webs are interleaved withl carbonsheets 11, 12, 13 and 14, which normally eX- tend as far as the printing line, and, from that line, the webs and the carbon-sheets, in the-operation of typing, pass above the usual front knife 15 and lie" upon a front paper-table 16. When a. form on the webs y1, 2, 3, etc., is fully typed, the platen is swung upon its swing-frame 17 by rotating makes it possible to retract the carbon-sheets, without undue friction being" created by the webs, which would be the case if the webs followed a curved path. The various sheets are gaged against a gage 20, adjustably mounted on the usual gage-member 21. The webs are held in the gaged position while the carbon-sheets are pulled backwardly by pushing upon the usual handle 22 to carryy rearwardly the carboni-paper carriage 23. The carriage travels on side-rails 24, connected at the rear by a cross-bar 25, to form an extension of the typewriter-carriage 7. Usually there is provided a stop 26 which serves tol arrest the carbon-paper carriage when the latter is pushed rearwardly by the handle 22. v

According to the present invention, the carbon-sheets, instead of being short sheets, as is customarily the case, are in the form of rolls of considerable length, the rolls supplying the carbons 11, 12, 13 and 14 being slipped over rollers orshafts 31, 32, 33 and 34, respectively. Each of the rolls is wound upon a. hollow cardboard cylinder 40 which is held to its shaft because of the elliptical cross-section of a portion 41 of each shaft, the greatest diameter of the ellipse exceeding the diameter of rolls'40. Each shaft 1s provided with an enlarged portion 42 near one end thereof, formingv a shoulder 43 against which the respective carbon-roll abuts. The enlarged portions 42 are each provided with an opening 44, said opening enlarging near the outer'end to form a shoulder 45 and an enlarged ope-ning 50. A stub 46 having a detent-wheel 47 at its outer end integral therewith is slidable in the enlarged opening 50, an'd is limited in its rearward movement by a pin 51 fixed to portion 42 and projecting into a slot 52 in the stub 46, and by detent-wheel 47 engaging the end `of portion 42. A spring 53, housed in opening 44, normally presses stub 46 outwardly toward the left and presses the shaft toward the right, so that short journals 54 and 55` fixed to each detent-wheel and the end of portion 41 of e'ach shaft, respectively, are held in bearings formed in blocks 56 and 57 fixed to standards or supports 58 and I59, respectively.

By pressing a detent-wheel 47, and hence stub 46, toward the, right against the action of spring 53, journal 54 will be withdrawn from bearing-block 56, and hence the shaft may be removed to allow the withdrawal or insertion of a carbon-roll.

The standards '58 and 59 are fixed to the carbon-sheet carriage by fastening means 60 passing through flanges 61 and 62 formed on the standards. TheJ latter are inclined forwardly to facilitate the feeding of the webs downwardly to guide-bars 63 fixed in standards 64 mounted on a forward extension65 of the carbon-sheet carriage. The guide-bars 63 serve to bring the webs and carbons together and feed them substantially horizontally to the rear bar 66 of the paper-table 6. f The rollers 31, 32, 33 and 34 are arranged oneabove the other in standards 58 and 59 spaced apart to allow the webs to pass freely between the carbon-rolls mounted thereon,-g.uidebars 70 and 71 being provided to hold the webs out of contact with the underlying carbon-rolls.

When the carbon-sheets` are drawn offthe rollers to the position shown in Figure 1, means are provided to prevent further rotation of shafts 31, 32, 33 and 34, and hence further unwinding of the carbon-rolls. For this purpose, a bar 75 is mounted on standard 58 for movement lengthwise of said ystandard by means of upper and lower pins 76 operating in longitudinal slots 77. Pins 78 fixed to bar 75 project through slots 79 in standard 58 and overlie the detent-wheels 47, which are provided with a roughened surface. A spring 80 fixed to a pin 81 on standard 58 and a pin 82 o n bar 75 normally pulls the bar downwardly to force pins 78 into engagement with the respective detentwheels 47. The detent-wheels are thus held against rotation, and hence the shafts 31,

32, 33 and-34 are held against rotation, since Athe shafts have a pin-and-slot connection "rolled from the carbon-rolls may be used repeatedly until worn out. lVhen it is desired to unwind fresh portions from the carboniolls, a knob 9() journaled in standard 58, and provided with a cam 91 underlying bar 75, is rotated, the cam lifting the bar against the action of spring 80, and hence'raising the pins 78 out of engagement with detentwheels 47 to permit rotation of the shafts 31, 32, 33 and 34 and unwinding of the carbon-rolls. When the new portions have been drawn off, knob 90 is rotated to its initial position, the cam allowing the bar 75 to fall and lock the detent-wheels against rotation.

Variations may be resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine, the combination with a traveling carri-age, of an extension on said carriage, a carbon-paper carriage reciprocable upon said extension, rollers mounted in said carbon-paper carriage, carbon-rolls mounted on said rollers and supplying carbon-sheets, means for locking each of said rollers against rotation to prevent unwinding of the carbon-rolls, and means for simultaneously unlocking all of said rollers to permit unwinding of said car-V bon-rolls.

2. In a typewriting machine, the combination with a traveling carriage, of an extension on said carriage, a carbon-paper carriage reciprocable upon said extension, supports mounted on said carbon-paper carriage, rollers mounted in said supports, carbon-rolls mounted on said rollers and sl1pplying carbon-sheets, a detent-wheel connected to each of said rollers, and means mounted on one of said supports and engaging said detent-wheels to lock each of l said rollers against rotation to prevent unwinding of the carbon-rolls, said means being movable to unlock all of said rollers,y

simultaneously to permit unwinding of said carbon-rolls.

3. In a typewriting machine, the combination with a traveling carriage, of an exmultaneously to Apermit unwinding of said carbon-rolls.

4. In a typewriting machine, the combination with a traveling, carriage, of an extension on said carriage, a carbon-paper jcarriage reciprocable upon' said extension, supports mounted on sald carbon-paper carriage, rollers mounted in said supports, carbon-rolls mounted on said roliers and supplying carbon-sheets, a detent-Wheel connected to each of said rollers, a member slidably mounted on one of said supports, pins fixed to said member and normally engaging said detent-Wheels to lock each of said rollers against rotation to prevent unwinding of the carbon-rolls, and cam-operating means mounted on said support and engaging said member for moving said member on said support to disengage all of said pins from said detent-Wheels simultaneously to'- permit unwinding of saidcarbon-rolls.

5. in a typewritingl machine, the combination wltb. a traveling carriage, yof an extension on said carriage, a carbon-paper carriage adapted to be reciprocated upon said extension, supports mounted on said carbon-paper carriage, rollers mounted in said supports, carbon-rolls mounted/ on said rollers and supplying carbon-sheets, a de- Vtent-Wheel connected to each of said rolls, a member slidably mounted on one of said supports, pins fixed to said member, a spring fixed to said member and to the co-operating support t`o normally press the pins into engagement With said detent-vvheels to lock each of said rollers against rotation to prevent unwindng ofsaid carbon-rolls, 'and cam means mounted on said (zo-operating support for moving said member against the action of said spring t0 disengage said pins from said detent-Wheels simultaneously and permit unwinding of said carbon-rolls.

JOSHUA E. DAVIDSON. Witnesses:

EDITH B. LIBBEY, JENNIE P. THORNE. 

